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Puzzle 10/08/16: D BBDB XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Aug 16, 2010 5:22 pm    Post subject: Puzzle 10/08/16: D BBDB XY Reply with quote
... and used gsf's solver to make a harder puzzle with fewer clues.

Code:
 +-----------------------+
 | . 9 . | . 1 . | . . . |
 | 5 . 1 | 8 9 . | 3 . . |
 | . 3 . | . 4 5 | 2 . . |
 |-------+-------+-------|
 | . 5 . | . . . | . . 1 |
 | 8 4 9 | . . . | . . . |
 | . . 3 | 4 . . | . . 8 |
 |-------+-------+-------|
 | . 1 5 | 2 . . | . . 7 |
 | . . . | . . . | . . . |
 | 2 . 7 | . . 1 | 4 . 3 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Aug 16, 2010 10:50 pm    Post subject: Reply with quote
Two steps..........

Quote:
xy-wing 2-67 vertex (27)r2c2; r1c789<>6 which sets up a

m-wing 27 with pseudocell ending: (2=7)r6c2-r2c2=r2c6-(7=6)r5c6-(6=2)r5c9; r6c8<>2

Ted
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Aug 17, 2010 6:05 pm    Post subject: Reply with quote
The same 3 elimination in r7c5 as my last solution was my goal - but I couldn't find a way to do it! Played the same move as Ted, though for me I found it as an xy-chain..
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Wed Aug 18, 2010 1:58 pm    Post subject: Reply with quote
There are several ways to remove more.

Code:
. 9 .|. 1 .|. 8 .
5 . 1|8 . .|3 . .
. 3 .|. 4 5|2 . .
-----+-----+-----
. 5 .|. . .|. . 1
8 4 9|. . .|. . .
. . 3|4 . .|. . 8
-----+-----+-----
. 1 5|2 . .|. . 7
. . .|. . .|. . .
2 . 7|. . 1|4 . 3


I don't like this puzzle now but it does have Kraken and Frank'n Fish!
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Aug 18, 2010 3:38 pm    Post subject: Reply with quote
Type 1 UR (68)
Medusa traps
XY-Wing, flightless with pincer transport
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Aug 18, 2010 3:56 pm    Post subject: Reply with quote
wapati wrote:
There are several ways to remove more.

Yes, gsf's solver listed 46 reductions on the original puzzle. I tried to select three with varying (and reasonable) solutions. Unlike this puzzle:

Code:
 +-----------------------+
 | . 9 . | . 1 . | . . . |
 | 5 . 1 | 8 . . | 3 . . |
 | . 3 . | . 4 5 | 2 . . |
 |-------+-------+-------|
 | . 5 . | . . 8 | 9 . 1 |
 | . 4 . | . . . | . . . |
 | . . 3 | 4 . . | . . 8 |
 |-------+-------+-------|
 | . 1 5 | 2 . . | . . 7 |
 | . . . | . . . | . . . |
 | 2 . 7 | . . . | 4 . 3 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Wed Aug 18, 2010 4:09 pm    Post subject: Reply with quote
wapati wrote:

Code:
. 9 .|. 1 .|. 8 .
5 . 1|8 . .|3 . .
. 3 .|. 4 5|2 . .
-----+-----+-----
. 5 .|. . .|. . 1
8 4 9|. . .|. . .
. . 3|4 . .|. . 8
-----+-----+-----
. 1 5|2 . .|. . 7
. . .|. . .|. . .
2 . 7|. . 1|4 . 3


Weirdly, it has a relatively straightforward one stepper!
Code:
ANP(56) (7=56)r1c79 - (6=2)r1c3 - (2=7)r2c2 ; r2c8<>7
singles

This move was present as an ANT(568) in Danny's original puzzle but it only made a mild dent in it...
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Wed Aug 18, 2010 6:49 pm    Post subject: Reply with quote
daj95376 wrote:
Unlike this puzzle:

I am sucker for this stuff, so for what it's worth ... though it's interesting how there are echos of previous puzzles

The first step is what's left of the ALS in r1c789
Code:
ANT(568) (7=568)r1c789 - (6=247)r1c13|r2c2 - (7)r3c1=r3c4 ; r1c46<>7
The next three sort of get us back into roughly the territory we were in with the last puzzle
Code:
AIC (7=2)r2c2 - r1c3=(2-3)r1c6=r1c4 - (3=7)r4c4 - (7)r3c4=r3c1 ; r1c1<>7
xyz-wing(78-6) r3c1 ; r1c1<>6
AIC (6=9)r2c8 - r3c9=r8c9 - (9=3)r8c1 - r8c6=r1c6 - (3=6)r1c4 ; r2c56<>6
(A sort of 69-3 xy-wing but with strong links extending each pincer)
Home and dry - same moves as from previous incarnations of this beast - including my ugly lengthy xy
Code:
x-wing(7) ; r4c5<>7
xy-chain (3=2)r4c5 - (2=6)r3c3 - (6=7)r3c1 - (7=2)r6c2 - (2=7)r6c8 - (7=8)r1c8 - (8=9)r7c8 - (9=3)r7c1 ; r7c5<>3
skyscraper(2) ; r2c5<>2, r5c6<>2
xy-wing(26-7) r5c9 ; r5c7<>7

So a BBDB rating I think! For me anyway..
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